you need at least one baffle, especialy since you refuse to use anything larger than 5 gal for top off. if you have the whole thing baffleless when your float valve opens it will drain your top off container. so you need to baffel a level control area for your top off, also you need to make the water level where your skimmer is constant, so a baffle to keep the water the right high there. so you need two compartments at least. putting a single baffle in the last 1/3 of the sump will keep the water the right hight in the first 2/3rds of the tank for the skimmer and the last 1/3 will fluxuate with your evaporation.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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